Any sealed/waterproof scooter motors?

Electric Motors and Controllers
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Quinc   10 W

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Any sealed/waterproof scooter motors?

Post by Quinc » Mar 29 2018 6:32pm

looking to add some power to my beach cart but need electronics that are sealed/be ok if they get submerged in salt water.

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Re: Any sealed/waterproof scooter motors?

Post by amberwolf » Mar 29 2018 10:02pm

Pretty much none of the motors is *completely* sealed; unless the motor is filled with oil to keep water out then it's better to actually have holes for the water to drain out, and to coat the important stuff inside with water"proof" paints or sealants.

If you look thru http://ebike.ca's blog page, there is an article with a video about water ingress testing, and the problems involved in trying to seal one so perfectly that water cant get in and get trapped (which will then cause corrosion, especially if it's salty).


For controllers and stuff, there's some that are sealed/potted up to IP66 or IP67, like the Phaserunner and a number of big-name brands. You could probably pot a generic one to keep water out, though without waterproof connectors you're still going to have some water wicking up the wires.

There's no sealed handlebar controls, though, and it's hard to completely seal them up mostly due to wire wicking, so your best bet is to use a cable-operated motorcycle type grip trhottle, and use the cable to control a regular throttle sealed up in a box somewhere, or something custombuilt. There's a number of threads/posts about such cable-operated throttles you can find in a search of the forum (might even still be some for sale).

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Re: Any sealed/waterproof scooter motors?

Post by markz » Mar 30 2018 8:36pm

Quinc wrote:
Mar 29 2018 6:32pm
looking to add some power to my beach cart but need electronics that are sealed/be ok if they get submerged in salt water.
Justin did some tests, he has a video, water can come in under the insulation and propogate up the conductor and into the motor. It was suprising how much. Its nothing to be concerned about, some people spray the inside of the motor with Insulating Varnish.

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Re: Any sealed/waterproof scooter motors?

Post by amberwolf » Mar 31 2018 2:45am

Since he's talking about saltwater, it *is* something to be concerned about.

As for the rest, I already posted about those things above.

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Re: Any sealed/waterproof scooter motors?

Post by Quinc » Apr 02 2018 5:14pm

Are car starter motors sealed? Was hoping to not have to fab up a waterproof box with midshaft but looking like that is my only option. Or a quick release to remove the motor once I get to the water.

Appreciate the replies! :)

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Re: Any sealed/waterproof scooter motors?

Post by Punx0r » Apr 03 2018 2:23am

Car starter motors are unvented but they're not sealed

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Re: Any sealed/waterproof scooter motors?

Post by amberwolf » Apr 03 2018 2:37am

They're also extremely low duty cycle motors meant to run only for a few seconds. Many of them (maybe most) don't even have bearings, but only bushings.

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Re: Any sealed/waterproof scooter motors?

Post by fechter » Apr 03 2018 10:16am

What about using the motor from an electric trolling motor? Those must be sealed.
"One test is worth a thousand opinions"

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Re: Any sealed/waterproof scooter motors?

Post by Quinc » Apr 03 2018 1:45pm

fechter wrote:
Apr 03 2018 10:16am
What about using the motor from an electric trolling motor? Those must be sealed.
Excuse me while I google how to add sprocket to trolling motor. :)

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Re: Any sealed/waterproof scooter motors?

Post by fechter » Apr 03 2018 3:00pm

It seems most of them just use a nut to hold the propeller onto the shaft.
trolling motor 2.GIF
trolling motor 2.GIF (43.38 KiB) Viewed 486 times
"One test is worth a thousand opinions"

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Re: Any sealed/waterproof scooter motors?

Post by spinningmagnets » Apr 03 2018 3:09pm

You might investigate if a submersible pump can be repurposed as a lower-voltage motor. I don't know if any are built for 12V/24V DC, but maybe worth a look.

A 3000-RPM motor that runs on 120V, might run at 1200-RPMs at 48V. Many "universal" motors run fine on either AC or DC...

If your needs are for a motor that will be immersed in liquid, heat would be MUCH less of an issue, so it should be fairly easy to fully pot an existing motor.

If yes, what is the ideal non-waterproof brushless motor for the job you need? Watts, volts, size, RPMs?

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Re: Any sealed/waterproof scooter motors?

Post by Quinc » Apr 03 2018 5:41pm

spinningmagnets wrote:
Apr 03 2018 3:09pm
You might investigate if a submersible pump can be repurposed as a lower-voltage motor. I don't know if any are built for 12V/24V DC, but maybe worth a look.

A 3000-RPM motor that runs on 120V, might run at 1200-RPMs at 48V. Many "universal" motors run fine on either AC or DC...

If your needs are for a motor that will be immersed in liquid, heat would be MUCH less of an issue, so it should be fairly easy to fully pot an existing motor.

If yes, what is the ideal non-waterproof brushless motor for the job you need? Watts, volts, size, RPMs?

I want need to move a 300lb jetski to the water through soft sand on a 4wd beach kart. The motor would only possibly be submerged for a few seconds or minutes at most. I will most likely gear it to the largest wheel sprocket I can fit for as much torque as possible and a 1.5-2.5mph top speed. I was hoping to use a 24v 500w scooter motor for the job or the 350w curie gear reduction motor. for the throttle I am thinking about a single 100% water proof on/off switch and SLA batteries. This way I will not have to worry about a controller or throttle getting wet.

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Re: Any sealed/waterproof scooter motors?

Post by SlowCo » Apr 04 2018 7:44am

Is it possible to mount the motors high enough so they stay above the water and run chains to the wheels?

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Re: Any sealed/waterproof scooter motors?

Post by fechter » Apr 04 2018 8:59am

Helps to know the application.

How about something like one of these:
MY1016Z2 motor.JPG
MY1016Z2 motor.JPG (44.22 KiB) Viewed 439 times
You can find these on eBay or at Electricscooterparts.com for around $100. This one is called a MY1016Z2, made by Unite Motor.

This is a brushed motor, which means you can easily reverse it and you can run it straight off the battery without a controller.
Ad indicated output is 400 RPM at 24v. For your use, it might be fine running off a 12v battery and it would go about 1/2 speed.

These are not waterproof, but if you sealed the housing with silicone and packed the gear reduction with grease, it would probably survive a short time underwater. The idea of mounting it high and extending the chain is a good one. You could even just place a plastic container over it so when it goes into the water, an air pocket is trapped in the container where the motor is, like a diving bell.
"One test is worth a thousand opinions"

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